and three states, california, nevada and florida, have already made self-driving vehicles legal as long as the human's sitting in the driver's seat in case of a emergency. that's a good idea. meanwhile, these cars could lose worker productivity. the average commuter spends 250 hours a year behind the wheel. or they could come in handy after you've had a couple cocktails. self-driving trucks could transform the trucking industry. picture long lines of self-driving 18-wheelers traveling down the highway just a few inches apart, no drivers, no stops for gas or food, it could boost fuel efficiency as much as 20%. we're going to need to keep driving ourselves though for a while longer. experts say the driverless cars should be more common in another ten to 15 years when the costs come down. here's the question, how would you feel about riding in a car that drives itself? go to cnn.com/caffertyfile, post a comment on my blog. or go to our post on the "the situation room" facebook page. i don't know if i'd trust a car to drive itself. >> me either. i wouldn't feel good about it at all, jack. n